CN103828247A - Adaptive tuning of an impedance matching circuit in a wireless device - Google Patents

Abstract

Techniques for adaptively tuning an impedance matching circuit are disclosed. In an aspect, the impedance matching circuit is pre-characterized. The performance of the impedance matching circuit is determined for multiple settings of the impedance matching circuit, stored in memory, and used to tune the impedance matching circuit. In another aspect, the impedance matching circuit is tuned based on measurements for one or more parameters such as delivered power, return loss, power amplifier current, antenna/load impedance, etc. In an exemplary design, an apparatus includes a memory and a control unit. The memory stores information for multiple settings of an impedance matching circuit. The control unit selects one of the multiple settings of the impedance matching circuit based on the information for the multiple settings and measurements for the impedance matching circuit. The impedance matching circuit performs impedance matching for a load circuit (e.g., an antenna) based on the selected setting.

Description

The self-adapting tuning of the impedance matching circuit in wireless device

Background technology

I. field

The disclosure relates in general to electronic equipment, relates in particular to the technology for the impedance matching circuit of tuning wireless device.

II. background

Wireless device (for example, cell phone or smart phone) in wireless communication system can transmit and receive data to carry out two-way communication.Wireless device can comprise the transmitter that transmits for data and for the receiver of data receiver.For data transmission, transmitter data available carrys out modulated RF (RF) carrier signal to obtain through modulation signal, amplifies through modulation signal and has the output RF signal of appropriate output power levels to obtain, and via antenna, this output RF signal is transmitted into base station.For data receiver, receiver can obtain and receives RF signal and can nurse one's health and process this and receive the data of RF signal to recover to be sent by base station via antenna.

Transmitter can comprise various circuit, such as power amplifier (PA), filter etc.Receiver also can comprise various circuit, such as low noise amplifier (LNA), filter etc.Impedance matching circuit can be coupling between antenna and transmitter and/or receiver, and can be antenna, power amplifier or LNA execution impedance matching.Impedance matching circuit can have a significant impact the performance of wireless device.

Accompanying drawing summary

Fig. 1,2 and 3 illustrates three exemplary design of wireless device.

Fig. 4 illustrates the schematic diagram of impedance matching circuit.

Fig. 5 A to 5F illustrates six kinds of configurations of the impedance matching circuit in Fig. 4.

Fig. 6 illustrates the plotting of eight kinds of different antenna efficiencies that arrange of impedance matching circuit.

Fig. 7 illustrates the look-up table of impedance matching circuit.

Fig. 8 A and 8B illustrate respectively return loss and the antenna efficiency of impedance matching circuit under different scenes.

Fig. 9 shows the block diagram of transducer and computing unit.

Figure 10 shows the process for tuned impedance match circuit.

Figure 11 shows the process for carrying out impedance matching.

Describe in detail

The detailed description of below setting forth is intended to the description as exemplary design of the present disclosure, and is not intended to represent to put into practice therein the design that only has of the present disclosure.Term " exemplary " is in this article for representing " as example, example or explanation ".Any design that is described as " exemplary " herein needn't be interpreted as being better than or surpassing other designs.This detailed description comprises that detail is to provide the thorough understanding to exemplary design of the present disclosure.To be apparent that for those skilled in the art do not have these details also can put into practice exemplary design described herein.In some instances, known structure and device illustrate in order to avoid fall into oblivion the novelty of the exemplary design providing herein with block diagram form.

This paper describes the technology for the impedance matching circuit of tuning/adjusting wireless device.These technology can be used for various types of wireless devices, such as cell phone, smart phone, flat-panel devices, PDA(Personal Digital Assistant), portable equipment, radio modem, laptop computer, intelligence basis, net book, cordless telephone, wireless local loop (WLL) stand, bluetooth equipment, consumer electronics, etc.

Fig. 1 shows the block diagram of the exemplary design of wireless device 100.In this exemplary design,wireless device 100 comprises data processor/controller 110,transceiver 120, self-adaptingtuning circuit 170 and antenna 152.Transceiver 120 comprisestransmitter 130 and thereceiver 160 of supporting two-way wireless communication.Wireless device 100 can be supported Long Term Evolution (LTE), code division multiple access (CDMA) 1X or cdma2000, wideband CDMA (WCDMA), global system for mobile communications (GSM), IEEE802.11, etc.

In transmission path,data processor 110 is processed (for example, coding and modulation) armed data and is provided analog output signal to transmitter 130.Intransmitter 130, transmitting (TX)circuit 132 to this analog output signal amplify, filtering it is upconverted to RF from base band, and provide through modulationsignal.TX circuit 132 can comprise amplifier, filter, frequency mixer, oscillator, local oscillator (LO) generator, phase-locked loop (PLL) etc.Power amplifier (PA) 134 receives and amplifies through modulation signal and the RF signal through amplifying with appropriate output power levels is provided.TX filter 136 is to carrying out filtering so that the signal component in emission band is passed through through amplification RF signal, and the signal component of decay in frequency acceptanceband.TX filter 136 provides output RF signal, and this output RF signal is routed byswitch 140 andimpedance matching circuit 150, and is launched via antenna 152.Impedance matching circuit 150 is carried out impedance matching forantenna 152, and be also known as antenna tuning circuit, tunable match circuit, etc.

In RX path,antenna 152 receives from the signal of base station and/or other transmitter stations and provides receives RF signal, and this receives that RF signal is routed by impedance matchingcircuit 150 andswitch 140 and is provided for receiver 160.Inreceiver 160, receive (RX)filter 162 and carry out filtering so that the signal component in frequency acceptance band is passed through to receiving RF signal, and the signal component of decay in emission band.LNA164 amplify fromRX filter 162 through filtering RF signal and input rf signal is provided.RX circuit 166 to this input rf signal amplify, filtering it is down-converted to base band from RF, and analog input signal is offered to data processor 110.RX circuit 166 can comprise amplifier, filter, frequency mixer, oscillator, LO generator, PLL, etc.

Self-adaptingtuning circuit 170 is tuning or regulate impedance matchingcircuit 150 to make it possible to reaching good performance as data transmission and reception.In self-adaptingtuning circuit 170,transducer 172 receives the input signal fromimpedance matching circuit 150, and measures voltage, electric current, power and/or other characteristic of these inputsignals.Computing unit 174 receives delivered power and/or the impedance from the measurement oftransducer 172 the viewed load of definite impedance matching circuit 150 (being theantenna 152 in Fig. 1).Control unit 180 receives from the delivered power ofcomputing unit 174 and/orimpedance.Control unit 180 also canreception environment transducer 176 output, from the PA electric current of PAcurrent sensor 178 and carry out the selected frequency band/channel of indication ofself processor 110 and/or the control signal of institute'slectotype.Control unit 180 also can receive the performance characterization that the difference of impedance matchingcircuit 150 may arrange from look-up table 182.Control unit 180 generates a control, to reach good performance, for example, obtains the higher delivered power to load for tunedimpedance match circuit 150.

Fig. 1 shows the exemplary design of self-adapting tuning circuit 170.Self-adapting tuning circuit also can comprise still less, different and/or othertransducer.Computing unit 174 can separate (as shown in fig. 1) withcontrol unit 180 or can be the part of control unit 180.The all or part of of self-adaptingtuning circuit 170 can be realized on digitlization ground.For example,computing unit 174 andcontrol unit 180 can be realized by data processor/controller 110.Look-up table 182 can be stored inmemory 112 or some other memory.

Fig. 1 shows the exemplary design oftransceiver 120 and self-adapting tuning circuit 170.The all or part of oftransceiver 120 and self-adaptingtuning circuit 170 realized at one or more analog integrated circuit (IC), RF IC(RFIC), in mixed-signal IC etc.Power amplifier 134 and other circuit of possibility can be realized in the IC separating or module.Impedance matchingcircuit 150 and other circuit of possibility also can be realized in the IC separating or module.

Data processor/controller 110 can bewireless device 100 and carries out various functions.For example, the data thatdata processor 110 can be received to the data of launching viatransmitter 130 and viareceiver 160 are carried out and are processed.Controller 110 can be controlled the operation ofTX circuit 132,RX circuit 166,switch 140 and/or self-adapting tuning circuit 170.Memory 112 can be stored for the program code of data processor/controller 110 anddata.Memory 112 can be in the inside of data processor/controller 110 (as shown in fig. 1) or in the outside (not shown in figure 1) of data processor/controller 110.Data processor/controller 110 can be realized on one or more application-specific integrated circuit (ASIC)s (ASIC) and/or other IC.

Fig. 2 shows the block diagram of the exemplary design of wireless device 200.In this exemplary design,wireless device 200 comprises data processor/controller 210, for thetransceiver 220 ofmain antenna 252a and self-adaptingtuning circuit 270a and forreceiver 222 and the self-adapting tuning circuit 270b of slave antenna 252b.Transceiver 220 comprises: thetransmitter 230a and thereceiver 260a that (i) support the two-way wireless communication of first mode/frequency band (for example, GSM); And (ii)support transmitter 230b and thereceiver 260b of two-way wireless communication of the second pattern/frequency band (LTE, cdma2000 or WCDMA).Pattern can be corresponding to LTE, cdma2000, WCDMA, GSM etc.Receiver 222 comprisesreceiver 260c and the 260d that supported data receives.Self-adaptingtuning circuit 270a and 270b can realize separately as illustrated in fig. 1.

Intransceiver 220,transmitter 230a comprises TX(transmitting) circuit 232a, power amplifier 234a and TX filter 236a.Receiver 260a comprises that RX(receives) filter 262a, LNA264a and RXcircuit 266a.Transmitter 230b comprises TX circuit 232b, power amplifier 234b and duplexer 238.Receiver 260b comprisesduplexer 238, LNA264b and RX circuit 266b.Switch 240a is coupled to TX filter 236a, RX filter 262a and duplexer 238.Duplexer 238 by from power amplifier 234b be routed to switch 240a through amplification RF signal, and the RF signal of receiving fromswitch 240a is routed to LNA264b.Impedance matching circuit 250a is coupling betweenswitch 240a and antenna 252a.Self-adapting tuning circuit 270a is coupled toimpedance matching circuit 250a and regulates impedance matchingcircuit 250a, to make the data transmission and the reception that can be viaantenna 252a reach good performance.

Inreceiver 222,receiver 260c comprises RX filter 262c, LNA264c and RX circuit 266c.Receiver 260d comprises RX filter 262d, LNA264d and RXcircuit 266d.Switch 240b is coupled to RX filter 262c and 262d.Impedance matching circuit 250b is coupling betweenswitch 240b and antenna 252b.Self-adapting tuning circuit 270b is coupled toimpedance matching circuit 250b and regulatesimpedance matching circuit 250b, reaches good performance to make to can be via the data receiver ofantenna 252b.

Fig. 3 shows the block diagram of the exemplary design of wireless device 300.In this exemplary design,wireless device 300 comprises data processor/controller 310,transceiver 320, self-adaptingtuning circuit 370a and 370b and antenna 352.Transceiver 320 comprisestransmitter 330 and thereceiver 360 of supporting two-waywireless communication.Transmitter 330 comprisesTX circuit 332,power amplifier 334 and theimpedance matching circuit 336 of series coupled.Receiver 360 comprisesimpedance matching circuit 362, LNA364 and theRX circuit 366 of series coupled.Switch/duplexer 350 is coupled toimpedance matching circuit 336 and 362, and is coupled to antenna 352.Self-adapting tuning circuit 370_abe coupled toimpedance matching circuit 336 and regulateimpedance matching circuit 336, to make the data transmission can be viaantenna 352 reach good performance.Self-adaptingtuning circuit 370b is coupled to impedance matchingcircuit 362 and regulatesimpedance matching circuit 362, reaches good performance to make to can be via the data receiver of antenna 352.Self-adaptingtuning circuit 370a and 370b can realize separately as illustrated in fig. 1.

Fig. 1,2 and 3 illustrates respectively three kinds of exemplary design of wireless device 100,200 and 300.Generally speaking, wireless device can comprise the antenna of any number, the transmitter of any number, and the receiver of any number.Wireless device also can be supported in the operation on the frequency band of any number.Wireless device can comprise one or more transmitters and/or one or more receiver for each antenna.Each transmitter and each receiver can be supported the operation on one or more frequency bands for given antenna.

Wireless device can be supported and time division duplex (TDD) system and/or Frequency Division Duplexing (FDD) (FDD) system communication.For with TDD system communication, wireless device can comprise can any given time or antenna-coupled to transmitter or antenna-coupled for example, to the switch (, theswitch 140 in Fig. 1) of receiver.For with FDD system communication, wireless device can comprise duplexer (for example, theduplexer 238 in Fig. 2), this duplexer simultaneously: (i) the output RF signal from power amplifier is routed to antenna; And (ii) the RF signal of receiving from antenna is routed to LNA.

As shown in Fig. 1,2 and 3, impedance matching circuit can be included in each position in wireless device, and is used to be coupled to the impedance matching of circuit of input and output of this impedance matching circuit.For example, impedance matching circuit (for example, theimpedance matching circuit 150 in Fig. 1) can be carried out the impedance matching between the output impedance of filter and the input impedance of antenna.Impedance matching circuit (for example, the impedance matchingcircuit 336 in Fig. 3) can also be carried out the impedance matching between the output impedance of amplifier and the input impedance of filter or antenna.

On the one hand, impedance matching circuit can be realized with one group of wattless component and one group of switch, and can support various configurations.Such impedance matching circuit can be called as reconfigurable impedance matching circuit.This group wattless component can be connected according to particular topology with this group switch, and this specific benefit of opening up can indicate each wattless component how to be connected with each switch.Difference setting by switch can be supported several configurations.Different configurations can join from different impedance-tumed curvilinear correlations.Each impedance-tumed curve can be corresponding to the attainable resistance value scope of this impedance matching circuit under the configuration being associated.This various configurations can make impedance matching circuit for example, to provide better impedance matching for load circuit (, antenna).Reconfigurable impedance matching circuit can carry out tuning in wider resistance value scope, and can be for load circuit provides better impedance matching in wider frequency range.

In an exemplary design, reconfigurable impedance matching circuit can comprise at least one variable wattless component, and each variable wattless component has the impedance that can change.(all) variable wattless components can make the impedance of reconfigurable impedance matching circuit can be by tuning so that better impedance matching to be provided, and this can improve performance.

In an exemplary design, reconfigurable impedance matching circuit can comprise at least one reconfigurable wattless component, and each reconfigurable wattless component can be connected to series element or vent diverter via at least one switch.For example, reconfigurable inductor can connect into series reactor and connect into shunting inductor in another kind configuration in one configuration.(all) reconfigurable wattless components can make the impedance of reconfigurable impedance matching circuit can be by tuning in wider resistance value scope, and this can provide better impedance matching.

Fig. 4 shows the schematic diagram of the exemplary design of reconfigurableimpedance matching circuit 410, and this circuit can be used to any in the impedance matching circuit in Fig. 1,2 and 3.Inimpedance matching circuit 410, variable capacitor (varactor) 422(C1) be coupling between the input and nodes X of impedance matching circuit 410.Varactor 424(C2) be coupling between nodes X and the output of impedance matching circuit 410.Varactor 426(C3) be coupling between nodes X and circuit ground.Switch 432(SW1) be coupling between the input and nodes X of impedance matching circuit 410.Switch 434(SW2) be coupling between nodes X and the output of impedance matching circuit 410.Inductor 442(L1) be coupling in nodes X and switch 452(SW3) input between.Switch 452 have be coupled toimpedance matching circuit 410 input first output (' 1 '), be coupled to circuit ground second output (' 2 ') and be not coupled to any circuit element float the 3rd output (' 3 ').Inductor 444(L2) be coupling in nodes X and switch 454(SW4) input between.Switch 454 have be coupled toimpedance matching circuit 410 output first output (' 1 '), be coupled to circuit ground second output (' 2 ') and float the 3rd output (' 3 ').Switch 452 can with (i) be coupling in the first switch between inductor L1 and the input ofimpedance matching circuit 410 and (ii) second switch that is coupling between inductor L1 and circuit ground realize.Switch 454 also can be realized according to the mode similar to switch 452 by pair of switches.

SwitchSW 1 and SW2 can disconnect or closed (, being placed in the one of two kinds of possible states) separately.Switch SW 3 and SW4 can be controlled so as to separately by input be connected to first, second or the 3rd output (, being placed in the one of three kinds of possible states).Varactor C1, C2 and C3 can be configured to position of minimum capacitance separately to obtain high impedance and open circuit is provided in fact.Varactor C1, C2 and C3 can have identical or different position of minimum capacitance.As described below,inductor 442 and 444 can be coupled into series element or vent diverter separately.

Impedance matching circuit 410 is supported various configurations, below will describe wherein some.Each configuration is associated with one group of state/setting ofswitch SW 1, SW2, SW3 and SW4.Each configuration also can be associated with the occurrence of varactor C1, C2 and/or C3.

Fig. 5 A to 5F illustrates six kinds of configurations of theimpedance matching circuit 410 in Fig. 4.Each configuration can obtain with switch setting and varactor setting shown in the accompanying drawing of this configuration of description.For each configuration, show main circuit footpath with thick dashed line.

Fig. 5 A illustrates theimpedance matching circuit 410 that is straight-through configuration.In this configuration, input signal is delivered to the output of impedance matchingcircuit 410 byswitch SW 1 and SW2.

Fig. 5 B illustrates theimpedance matching circuit 410 that is the configured in series with series connection L1.In this configuration, input signal is delivered to the output of impedance matchingcircuit 410 by switch SW 3, inductor L1 andswitch SW 2.

Fig. 5 C illustrates theimpedance matching circuit 410 that is the shunting configuration with shunting L1.In this configuration, input signal passes throughswitch SW 1, is applied to inductor L1(inductor L1 and is coupled to circuit ground via switch SW 3), and be delivered to the output ofimpedance matching circuit 410 byswitch SW 2.

Fig. 5 D illustrates theimpedance matching circuit 410 that is " L " type configuration with series connection L1 and shunting C3.In this configuration, input signal passes through switch SW 3 and inductor L1, is applied to varactor C3, and is delivered to the output ofimpedance matching circuit 410 byswitch SW 2.

Fig. 5 E illustrates theimpedance matching circuit 410 that is " R " type configuration with shunting L2 and series connection C2.In this configuration, input signal passes throughswitch SW 1, is applied to inductor L2(inductor L2 and is coupled to circuit ground via switch SW 4), and be delivered to the output of impedance matchingcircuit 410 by varactor C2.

Fig. 5 F illustrates theimpedance matching circuit 410 that is the T-shape configuration with series connection L1, shunting C3 and series connection L2.In this configuration, input signal passes through switch SW 3 and inductor L1, is applied to varactor C3, and is delivered to the output ofimpedance matching circuit 410 by inductor L2 andswitch SW 4.

Generally speaking, impedance matching circuit can comprise the wattless component of any number that can be coupled by any means and the switch of any number.Wattless component can be inductor or capacitor.Impedance matching circuit can be supported the configuration of any number, wherein can comprise one or more in following configuration:

Without any the straight-through configuration of L or C,

There is the configured in series of series connection L and/or series connection C,

There is the shunting configuration of shunting L and/or shunting C,

There is (i) series connection C and shunting L, (ii) series connection L and shunting C, (iii) series connection C and shunting C or (iv) " L " type configuration of series connection L and shunting L,

" R " type configuration that there is (i) shunting C and series connection L, (ii) shunting L and series connection C, (iii) shunting C and series connection C or (iv) shunt L and series connection L,

There is (i) shunting C, series connection L and shunting C or (ii) " Π (Pi) " type configuration of shunting L, connect C and shunting L,

There is (i) series connection C, shunting L and series connection C or (ii) the T-shape configuration of series connection L, shunting C and series connection L, and

Other configurations.

Impedance matching circuit also can be supported other configuration.

Impedance matching circuit can for example, the impedance matching for load circuit (, antenna) according to variety of way.Load circuit can have at different frequency place different resistance values.Impedance matching circuit should be in the impedance of selected operating frequency place matched load circuit.

On the one hand, impedance matching circuit can be characterized in advance based on measurement, Computer Simulation etc. during design phase, manufacture and/or work on the spot.Can characterize in advance for the multiple setting of impedance matching circuit (or circuit setting) performance of impedance matching circuit.Each circuit setting can be associated with the concrete control setting of the variable wattless component in concrete setting, (iii) impedance matching circuit of the switch in concrete configuration, (ii) impedance matching circuit of (i) impedance matching circuit and (iv) performance characterization.This multiple circuit setting can be corresponding to the different value of the variable wattless component in the difference configuration of impedance matching circuit and/or impedance matching circuit.The performance characterization of different circuit settings can be stored in look-up table (LUT) and be used to tuned impedance match circuit.

Fig. 6 illustrates the plotting of the antenna efficiency arranging according to eight of a kind of impedance matching circuit for low-frequency band of exemplary design kinds of different circuit.In Fig. 6, transverse axis represents the frequency take MHz as unit, and the longitudinal axis represents the antenna efficiency take decibel (dB) as unit.Being denoted as LUT1 illustrates to 626 by marking and drawing 612 respectively with respect to frequency to the antenna efficiency of eight kinds of different circuit settings of LUT8.As shown in Figure 6, each circuit is arranged on characteristic frequency place and has peak value antenna efficiency, and can provide superperformance for the frequency of the certain limit of covering peak value antenna efficiency.Can choose these eight kinds of circuit settings makes the peak value antenna efficiency of these circuit settings occur in the different frequency place being evenly spaced apart as far as possible.Alternatively, can choose these eight kinds of circuit settings and the peak value antenna efficiency of these circuit settings is occurred in can be used to different frequency bands or the channel place of communication.In any situation, can the operating frequency based on wireless device select a kind of circuit setting for use.For example, in the time being operated in 800MHz, can select LUT3 to arrange, in the time being operated in 900MHz, can select LUT5 to arrange, etc.By regulating the one or more variable wattless component in impedance matching circuit, the frequency response that selected LUT arranges can change.

Fig. 6 illustrates that the different circuit settings of impedance matching circuit are for a class frequency response of low-frequency band.Also can obtain the different circuit settings of impedance matching circuit for a class frequency response of high frequency band (for example, higher than 1GHz).

In general, the performance of impedance matching circuit can for example characterize in advance for the circuit setting of any number during design phase, manufacture, work on the spot etc.For example, can select the one configuration of impedance matching circuit to assess at every turn.For each selected configuration, can measure (likely can measure for the different value of (all) the variable wattless components in impedance matching circuit) one or more parameters, such as delivered power, return loss and/or PA electric current.Can select and be stored in the set of circuits setting that different frequency place has peak value/optimum performance.Each selected circuit setting can be particular frequency range good transmitting and/or receptivity is provided.

Selected set of circuits setting can be arranged by be dull order with respect to frequency, is set to the circuit setting at highest frequency place with optimum performance from have the circuit of optimum performance in low-limit frequency.By the different circuit settings of pre-sign and they are arranged with monotone order, the search that optimal circuit is arranged just can be more easily and execution more accurately.For example, can select circuit setting corresponding to the operating frequency of wireless device for use.As another example, can carry out the search that optimal circuit is arranged, and (for example,, by the frequency increasing progressively) selected a kind of circuit setting and it assessed to determine which kind of circuit setting is best at every turn.In this this two examples, all can improve by the different circuit settings of pre-this impedance matching circuit of sign the tuning of impedance matching circuit.

Can characterize in advance for several circuit settings and identical load circuit the performance of impedance matching circuit, as described above.Also can and be coupled to the input of impedance matching circuit and/or the different loads circuit of output characterizes the performance of impedance matching circuit in advance for several circuit settings.For example, impedance matching circuit such as, can be coupled to different TX filters and/or different RX filter in different mode (LTE, cdma2000, WCDMA, GSM etc.).

Fig. 7 illustrates the exemplary design of the look-up table (LUT) 700 of impedance matching circuit.In this exemplary design, can select impedance matching circuit to there is the K kind circuit setting of peak value/optimum performance at K different frequency place, wherein K can be any integer value.Look-up table 700 can be stored the relevant information that every kind of circuit arranges, such as (i) this circuit arrange applicable frequency or frequency range, (ii) the switch in impedance matching circuit concrete setting, (iii) the variable wattless component in impedance matching circuit concrete control setting, (iv) this circuit arranges applicable frequency band and/or pattern (such as LTE, cdma2000, WCDMA, GSM etc.).Look-up table 700 for example can be stored in, in nonvolatile memory (memory 112 in Fig. 1).

Utilize look-up table 700, can select suitable circuit setting to carry out impedance matching by the operating frequency based on wireless device.Can retrieve switch setting and the control setting that selected circuit arranges from look-up table 700.The switch setting retrieving can be applied to the switch in impedance matching circuit, and the control setting retrieving can be applied to the variable wattless component in impedance matching circuit.

Impedance matching circuit can be used to make the impedance matching of the antenna on wireless device in target impedance, for example, and as shown in Figure 1.The impedance of antenna can alter a great deal to another kind of Antenna Design from a kind of Antenna Design.In addition, antenna impedance can alter a great deal with frequency.Wireless device (for example, cell phone or smart phone) is held in user's hand conventionally, and can be placed on user's ear and head side.Antenna impedance can for example, approach wireless device and change due to human body (, hand, ear, etc.).

Fig. 8 A illustrates the return loss (S11) that is coupled to the impedance matching circuit of antenna under different sights in wireless device.In Fig. 8 A, transverse axis represents the frequency take MHz as unit, and the longitudinal axis represents the return loss take dB as unit.Impedance matching circuit can have multiple circuit setting (for example, eight kinds of circuit settings shown in Fig. 6), and these circuit settings can be associated with the peak performance at different frequency place.Impedance matching circuit can have marks and draws the return loss in free space shown in 812, and now wireless device is not held in user's hand.In the time that wireless device is held in user's hand, impedance matching circuit can have marks and draws the return loss shown in 814.Body effect can make resonance frequency decay and the displacement of antenna, and this may cause the return loss of impedance matching circuit to have corresponding frequency displacement.Marking and drawing 812 can arrange to obtain with the LUT2 in Fig. 6.Can be chosen in the LUT3 setting that higher frequency place has peak performance.In the time that wireless device is held in user's hand, use LUT3 to arrange, impedance matching circuit can have marks and draws the return loss shown in 816.Thus, the frequency displacement causing due to body effect can be by selecting another kind of circuit setting to compensate for impedance matching circuit.

Fig. 8 B illustrates the antenna efficiency that is coupled to the impedance matching circuit of antenna under different sights in wireless device.Mark and draw 822 and show the antenna efficiency that in free space, LUT2 arranges, show and mark and draw 824 the antenna efficiency that in free space, LUT3 arranges.Mark and draw 832 and show the antenna efficiency that LUT2 arranges in the time that wireless device is held in user's hand.Mark and draw 834 and show the antenna efficiency that LUT3 arranges in the time that wireless device is held in user's hand.As shown in Fig. 8 B, in free space, LUT2 is arranged on 750MHz place and has optimal antenna efficiency, but in the time that wireless device is held in user's hand, and LUT3 is arranged on 750MHz place to be had than LUT2 better antenna efficiency is set.In the time that wireless device is held in user's hand, being switched to LUT3 arranges and has improved antenna efficiency.

Such as, in the time being placed to next-door neighbour's human body (hand, ear etc.), the frequency response that the given circuit of impedance matching circuit arranges is shifted to lower frequency conventionally.This frequency displacement can have by being chosen in peak performance at higher frequency place another circuit setting in free space compensates, for example, and as shown in Fig. 8 B.The multiple circuit setting of impedance matching circuit can the peak performance frequency based on them be sorted, for example, as shown in Figure 6, from low-limit frequency to highest frequency.In this case, in the time detecting that frequency response has been shifted, can select next circuit setting to assess.Multiple circuit setting is sorted and therefore can be simplified tuning to impedance matching circuit.

On the other hand, can be based on the measurement of one or more parameters (such as delivered power, return loss, PA electric current, antenna/load impedance etc.) is carried out to the impedance matching circuit in tuning wireless device.Measurement can by self-adapting tuning circuit wireless device normal/make during work on the spot.Measurement can be used to tuned impedance match circuit and reach superperformance to make can be wireless device.

Fig. 9 illustrates the block diagram of the exemplary design oftransducer 172 in Fig. 1 and computingunit 174.In transducer 172,programmable attenuator 912 receiveimpedance matching circuit 150 input V1 signal and the first input signal is provided.Programmable attenuator 914 receiveimpedance matching circuit 150 output V2 signal and the second input signal is provided.Programmable attenuator 912 and 914 can be depending on output power levels variable attenuation is provided, to reduce the dynamic range of the input signal that offers the circuit in transducer 172.Buffer (Buf) 916 receives and cushions the first input signal and the first sensing signal V is provided_s1, signal V_s1can be V1 signal through zoomversion.Phase shifter 920 receives V_s1signal and in interested frequency by 90 ° of its phase shifts, and provide through phase shift signalling.Fixedgain amplifier 918 receives the first input signal and receives the second input signal at non-inverting input at inverting input, and the second sensing signal V is provided_s2.V_s2signal can be indicated the pressure drop of transimpedance match circuit 150.Multiplier 922 by fromphase shifter 920 through phase shift signalling with from the V ofamplifier 918_s2signal multiplication also provides multiplier output signal.Low pass filter 924 receives multiplier output signal, filtering high fdrequency component, and transducer output Y is provided_oUT.

Incomputing unit 170,unit 930 receiving sensor outputs series impedance Z divided byimpedance matching circuit 150 by it_samplitude and delivered power P is provided_oUT, delivered power P_oUTcan be expressed as:

P_oUT=V_aMP_ PKI_{lOAD_PK}cos (φ), formula (1)

Wherein V_{aMP_PK}v_s1the crest voltage of signal,

I_{lOAD_PK}the peak current that is delivered to loadcircuit 154, and

φ is the phase place that depends on the mismatch betweenimpedance matching circuit 150 andload circuit 154, and can be close to 0 degree in the time having matched well.

In exemplary design shown in Figure 9, V1 signal is by phase shift and V_s2signal multiplication.P in formula (1)_oUTtherefore power can be the power that is delivered to impedance matchingcircuit 150 and load circuit 154.Load circuit 154 can modeling antenna 152.Becauseimpedance matching circuit 150 can have little loss, therefore P_oUTthe overwhelming majority of power can be delivered to loadcircuit 154.

In Fig. 9, in unshowned another exemplary design, V2 signal can be by phase shift and V_s1signal multiplication.Therefore power output can be the power that is delivered to load circuit 154.From the power output ofcomputing unit 174 can thereby indication at signal by tap and offer the power that send at the some place ofphase shifter 920.

Series impedance Z_sbe impedance matchingcircuit 150 input and output between impedance.The amplitude of series impedance | Z_s| can determine in every way.In one design, | ZS| can determine via Computer Simulation, experience measurement or other means.In another design, | ZS| can be calibrated in advance.For example, can export for known output power measurement transducer, and can determine based on this known power output and the transducer recording output | Z_s|.| Z_s| also can otherwise come to determine.

The load impedance Z ofload circuit 154_lload voltage V that can be based onload circuit 154 places_land offer the load current I ofload circuit 154_ldetermine.Load voltage can be determined by measuring V2 signal.Load current can also be determined this pressure drop by measuring across the pressure drop of series impedance divided by series impedance.Ifload circuit 154 is corresponding to antenna, load impedance will be corresponding to antenna impedance.Load impedance can be used to calculate parameters.

Reflection coefficient ρ can be calculated as follows based on load impedance:

$\mathrm{\ρ}=\frac{Z_L-Z_O}{Z_L+Z_O},$Formula (2)

Wherein Z_obe characteristic impedance and can be 50 ohm or certain other value.

Return loss take dB as unit can be expressed as:

Return loss (dB)=10*log₁₀(ρ²).Formula (3)

Mismatch loss take dB as unit can be expressed as:

Mismatch loss (dB)=-10*log₁₀(1-ρ²).Formula (4)

Incident power, delivered power and reflection power can be expressed as:

P_send=P_incident-P_reflection, formula (5)

Wherein P_sendbe be delivered to load circuit 154(or by aerial radiation) power,

P_incidentbe available to the power ofimpedance matching circuit 150, and

P_reflectionbecause the mismatch atload circuit 154 places causes the power being reflected.

Delivered power can also be expressed as P_send=(1-| ρ |²) P_incident.Reflection power can also be expressed as P_reflection=| ρ |²p_incident.

Return loss and mismatch loss can be expressed as follows based on incident power and reflection power:

Return lossand formula (6)

Mismatch loss

formula (7)

Fig. 9 illustrates the exemplary design that can measure viaimpedance matching circuit 150transducer 172 and thecomputing unit 174 of delivered power and/or other parameter.Delivered power and/or other parameter also can otherwise be measured.Antenna/load impedance can be based on determining from the voltage measurement oftransducer 172.

Generally speaking, M the measurement at the M in impedance matching circuit difference place can be used to solve M variable or unknown number.For example, three voltage measurement V1, V2 and V3 can be used to determine antenna impedance, delivered power and incident power.According to via measuring the parameter obtaining, can calculate other parameters such as return loss, mismatch loss, reflection power.

PA electric current can be measured in every way.In an exemplary design, PA electric current can directly be measured.The bias current of power amplifier for example, can be provided via transistor.Comprise this transistorized current mirror can be used to obtain this bias current through proportional zoom version, this can be measured through proportional zoom version.In another exemplary design, PA electric current can be measured indirectly.For example, the relation between the bias voltage of the gain transistor in power amplifier and the bias current of power amplifier can be characterized and be stored.Bias voltage can be applied to gain transistor, and the bias current of power amplifier can be determined by the bias voltage based on applied.

Generally speaking, can be based on measuring parameter and any parameter of determining any number.In an exemplary design, can during design phase, manufacture and/or work on the spot, make and measure and use it for structure look-up table 700.For example, the measurement of the different possible circuit setting to impedance matching circuit can make and be used to calculating return loss, mismatch loss, delivered power etc. during design phase, manufacture and/or work on the spot.Can build look-up table 700 based on obtained parameter value being set for the different circuit of impedance matching circuit subsequently.In an exemplary design, duration of work is made measuring and using it for and is regulated impedance matching circuit so that superperformance to be provided at the scene.

Figure 10 illustrates the exemplary design of carrying out theprocess 1000 of the impedance matching circuit in tuning wireless device based onmeasurement.Process 1000 comprisesinitial phase 1010 and operational phase 1020.Initial phase 1010 can (for example, in the time that communication session starts) be performed once.Operational phase 1020 can be performed one or many during communication session.

Atinitial phase 1010, can be that impedance matching circuit selects circuit that X(frame 1012 is set for the operating frequency of free space based on wireless device).For example, if operating frequency is 750MHZ, can select the LUT2 in Fig. 6 to arrange.Selected circuit arranges X and can be denoted as LUT X or LUT X are set, and wherein X is the index that selected circuit arranges.Impedance matching circuit can be configured or arranged into LUT and X(is set equally atframe 1012).Can X be set for LUT measures delivered power (P1), return loss (S1), PA electric current (I1) and/or other parameter and can be stored in (frame 1014) on wireless device.The direction (or LUT direction) that LUT regulates can be set as " neutrality " (frame 1016).LUT direction can be set as at first " neutrality " and select to allow for impedance matching circuit that next is higher or next is compared with low circuit setting.

In the operational phase 1020, can X be set for current LUT and measure delivered power (P2), return loss (S2), PA electric current (I2) and/or other parameter (frame 1022).Whether the delivered power of making subsequently most recent measures determine (frame 1024) in target zone.If answer is "Yes", the direction that LUT regulates can be set as " neutrality " (frame 1026).Otherwise, between the measurement that can measure and preserve in the most recent to delivered power, return loss, PA electric current and/or other parameter, compare (frame 1028).For example, if most recent measurement is better than preserved measurement (, if P2 >=P1 and/or S2≤S1), can make current LUT direction whether to be set to " neutrality " or " increase " determine (frame 1030).If the answer of frame 1030 is "Yes", can select next higher circuit that X+1 is set, impedance matching circuit can be set as new LUT X+1 is set, and LUT direction can be set to " increase " (frame 1032).Otherwise, if the answer of frame 1030 is "No", can select next compared with low circuit, X-1 to be set, impedance matching circuit can be set as new LUT X-1 is set, and LUT direction can be set to " reducing " (frame 1034).

Be not better than preserved measurement (frame 1028 for "No") if most recent is measured, can make current LUT direction and whether will be set to definite (frame 1036) of " neutrality " or " increases ".If the answer offrame 1036 is "Yes", can select next compared with low circuit, X-1 to be set, impedance matching circuit can be set as new LUT X-1 is set, and LUT direction can be set to " reducing " (frame 1038).Otherwise, if the answer offrame 1036 is "No", can select next higher circuit that X+1 is set, impedance matching circuit can be set as new LUT X+1 is set, and LUT direction can be set to " increase " (frame 1040).Afterframe 1032,1034,1038 or 1040, most recent measurement can be kept on wireless device for use (frame 1042) in next tuning circulation.

The operation ofprocess 1000 can explain orally by two kinds of situations.In the first example,initial phase 1010 can be carried out in the time that wireless device is in free space, and theoperational phase 1020 can carry out in the time that wireless device is close to human body.In this example, P2 may be less than P1, and S2 may be greater thanS1.Frame 1040 can be performed with (i) increasing circuit setting and compensate the displacement to lower frequency causing due to next-door neighbour's human body, and (ii) LUT direction is made as to " increase " may select next higher circuit setting.In the second example,initial phase 1010 can be carried out in the time that wireless device is close to human body, and theoperational phase 1020 can carry out in the time that wireless device is in free space.In this example, P2 may be greater than P1, and S2 may be less thanS1.Frame 1034 can be performed (i) to reduce circuit setting, and (ii) LUT direction is made as to " reducing " may select next compared with low circuit setting.

Frame 1022 to 1042 can periodically be carried out, for example, to search iteratively the circuit setting that optimum performance (, best delivered power or return loss or PA electric current) can be provided.This iteration search can compensate the displacement (for example, because next-door neighbour's human body causes) of the resonance frequency of antenna, the performance that this can improve transmitting and/or receive.

Aspect another, the impedance matching circuit in wireless device can come tuning based on the environmental information of wireless device.Environmental information can be any information relevant with the user of wireless device or its environment/periphery.Environmental information can obtain via various transducers, such as proximity sensor, accelerometer, infrared sensor, temperature sensor etc.Environmental information can be used to tuned impedance match circuit and reach superperformance to make can be wireless device.

Generally speaking, impedance matching circuit can come based on any input set tuning, and input set can comprise selected operating frequency, institute's lectotype of wireless device etc. of measurement, environmental information, wireless device.Input can be used to select the initial circuit setting of impedance matching circuit.After this, can for example, obtain and measure (for example, the measurement to delivered power, return loss, PA electric current, antenna/load impedance etc.) for current circuit setting (, occasionally or periodically).These measurements can be used to select another circuit setting of impedance matching circuit.By being stored in one group of pre-circuit setting characterizing in look-up table, the iteration search that can facilitate for example, circuit to thering is optimum performance (, best delivered power, return loss, PA electric current etc.) to arrange.This group circuit arranges can predetermined order (for example, as shown in Figure 6, the peak performance frequency based on them) arrange.This predesigned order can be simplified the selection that next circuit to assessing arranges, for example, and as shown in Figure 10.

Self-adapting tuning technology described herein can provide various advantages.These technology can provide the better impedance matching on wide frequency ranges more.These technology can be supported in the operation on single frequency band or multiple frequency band, and operating frequency that can extended wireless device.These technology also can be supported the impedance matching of different inputs and/or output loading (for example,, for different mode).These technology also can be supported carrier aggregation, transmission on multiple carrier waves time.Each carrier wave can have a specific bandwidth (for example, 20MHz or still less).These technology can also be supported multiple-input and multiple-output (MIMO) operation, receive diversity, transmit diversity, etc.

In an exemplary design, a kind of device (for example, wireless device, IC, circuit module etc.) can comprise memory and control unit.Memory (for example, thememory 112 in Fig. 1) can be stored the information about the multiple setting of impedance matching circuit, for example, be stored in look-up table, in the look-up table 700 in Fig. 7.Control unit (for example, thecontrol unit 180 in Fig. 1) can be based on about impedance matching circuit this multiple setting information and the measurement of impedance matching circuit is selected to the one setting in this multiple setting of impedance matching circuit.

In an exemplary design, can be each in this multiple setting and arrange the performance of pre-sign impedance matching circuit.Pre-sign can be carried out during design phase, manufacture and/or work on the spot.Memory can be stored the information of this multiple performance that lower impedance matching circuit is set of indication.This multiple setting can be associated with obtaining residing different frequency when peak performance, for example, and as shown in Figure 6.This multiple setting can be sorted based on obtaining residing frequency when peak performance.In an exemplary design, memory can be every kind arrange that this at least one switch that at least one switch in applicable frequency or frequency range, impedance matching circuit is set of storage indication arranges, at least one variable wattless component in impedance matching circuit at least one control and arrange or the information of its combination, for example, as shown in Figure 7.

In an exemplary design, measurement can relate to delivered power, return loss, load impedance, PA electric current or its combination.Control unit can be based on measuring the one setting of selecting in multiple setting of impedance matching circuit.

In an exemplary design, control unit can the operating frequency based on wireless device be selected the initial setting up of impedance matching circuit, for example, and as shown in theframe 1012 in Figure 10.Control unit can be based on the measurement of impedance matching circuit being selected in this multiple setting next higher setting or next lower setting, for example, as shown in theframe 1032,1034,1038 or 1040 in Figure 10.Next is lower arrange can be lower than and the frequency place that approaches the frequency of the peak performance of initial setting up most there is the setting of peak performance.Next is higher arrange can be higher than and the frequency place that approaches the peak performance frequency of initial setting up most there is the setting of peak performance.For example, initial setting up can be that the LUT2 in Fig. 6 arranges, and next lower setting can be that LUT1 arranges, and next higher setting can be that LUT3 arranges.In an exemplary design, control unit can (i) periodically receive the measurement to impedance matching circuit, and (ii) based on these property measuring period determine and maintain Set For Current or select new setting for impedance matching circuit.

In an exemplary design, the control unit further environmental information based on wireless device is selected the one in this multiple setting.Control unit also can be selected to arrange based on out of Memory.

In another exemplary design, a kind of device (for example, wireless device, circuit module etc.) can comprise load circuit and impedance matching circuit.Impedance matching circuit (for example,impedance matching circuit 150 in Fig. 1) can the one setting based in multiple setting to carry out impedance matching for load circuit, this arranges can be the information of this multiple setting based on about impedance matching circuit and the measurement of impedance matching circuit is selected for impedance matching circuit.In an exemplary design, impedance matching circuit can comprise multiple wattless components and at least one switch, and can support various configurations, for example, and as shown in Figure 4.This various configurations can comprise configured in series, shunting configuration, the configuration of " L " type, the configuration of " R " type, the configuration of " Π " type, T-shape configuration or its combination.This multiple setting of impedance matching circuit can be associated with some or all of this various configurations of impedance matching circuit.

In an exemplary design, load circuit can comprise antenna, and impedance matching circuit can be antenna carry out impedance matching, for example, as shown in fig. 1.In another exemplary design, load circuit can comprise power amplifier, and impedance matching circuit can be that power amplifier is carried out output impedance coupling, for example, and as shown in Figure 3.In another exemplary design, load circuit can comprise LNA, and impedance matching circuit can be carried out input impedance coupling for LNA.Impedance matching circuit also can be the load circuit of other type and carries out impedance matching.

Figure 11 illustrates the exemplary design of theprocess 1100 for carrying out impedance matching.Can store the information about the multiple setting of impedance matching circuit, for example, be stored in by (frame 1112) in the look-up table on memory.Can obtain the measurement (frame 1114) to impedance matching circuit.The information of this multiple setting that can be based on about impedance matching circuit and the measurement of impedance matching circuit is selected to the one setting (frame 1116) in this multiple setting of impedance matching circuit.

In an exemplary design, can be each in this multiple setting and arrange the performance of pre-sign impedance matching circuit.Can store the information of this multiple performance that lower impedance matching circuit is set of indication and use it for and select one to arrange for use.

In an exemplary design, measurement can relate to delivered power, return loss, load impedance, PA electric current or its combination.Can be based on measuring the one setting of selecting in this multiple setting of impedance matching circuit.

In an exemplary design, can the operating frequency based on wireless device select the initial setting up of impedance matching circuit.After this next higher setting or next lower setting that, can be based on the measurement of impedance matching circuit being selected in this multiple setting.In an exemplary design, can periodically obtain the measurement to impedance matching circuit.Can based on property measuring period make will for impedance matching circuit maintain Set For Current or select newly-installed determine.

Impedance matching circuit described herein, self-adapting tuning circuit and self-adapting tuning technology can realize on IC, analog IC, RFIC, mixed-signal IC, ASIC, printed circuit board (PCB) (PCB), electronic equipment etc.Impedance matching circuit and self-adapting tuning circuit also can be manufactured by various IC technologies, such as complementary metal oxide semiconductors (CMOS) (CMOS), N-channel MOS (NMOS), P channel MOS (PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), SiGe (SiGe), GaAs (GaAs), heterojunction bipolar transistor (HBT), High Electron Mobility Transistor (HEMT), silicon-on-insulator (SOI) etc.

The device of realizing impedance matching circuit described herein, self-adapting tuning circuit and self-adapting tuning technology can be self-support equipment or compared with a part for large equipment.Equipment can be the IC that (i) supports oneself, (ii) there is the set of one or more IC, it can comprise the memory IC for storing data and/or instruction, (iii) RFIC, such as RF receiver (RFR) or RF emittor/receiver (RTR), (iv) ASIC, such as mobile station modems (MSM), (v) can be embedded in the module in other equipment, (vi) receiver, cell phone, wireless device, hand-held set or mobile unit, (vii) other etc.

In one or more exemplary design, described function can realize in hardware, software, firmware or its any combination.If realized in software, each function can be used as one or more instruction or code storage on computer-readable medium or mat its transmit.Computer-readable medium comprises computer-readable storage medium and communication media, comprises any medium of facilitating computer program to shift to another ground from a ground.Storage medium can be can be by any usable medium of computer access.As example and non-limiting, such computer-readable medium can comprise RAM, ROM, EEPROM, CD-ROM or other optical disc storage, disk storage or other magnetic storage apparatus, maybe can be used to carry or store instruction or data structure form expectation program code and can be by any other medium of computer access.Any connection is also by rights called computer-readable medium.For example, if software be use coaxial cable, fiber optic cables, twisted-pair feeder, digital subscribe lines (DSL) or the wireless technology such as infrared, radio and microwave from web website, server or other remote source transmission, this coaxial cable, fiber optic cables, twisted-pair feeder, DSL or the wireless technology such as infrared, radio and microwave are just included among the definition of medium.As used herein, dish (disk) and dish (disc) comprise compact disc (CD), laser dish, laser disc, digital versatile dish (DVD), floppy disk and blu-ray disc, its mid-game (disk) is often with the mode rendering data of magnetic, and dish (disc) with laser with optical mode rendering data.Above combination also should be included in the scope of computer-readable medium.

Providing previous description of the present disclosure is in order to make any person skilled in the art all can make or use the disclosure.To be apparent for those skilled in the art to various modifications of the present disclosure, and the generic principles of definition herein can be applied to other distortion and can not depart from the scope of the present disclosure.Thus, the disclosure is not intended to be defined to example described herein and design, but should be awarded the widest scope consistent with principle disclosed herein and novel features.

Claims (26)

1. a device, comprising:

Memory, described memory is configured to the information of storage about the multiple setting of impedance matching circuit; And

Control unit, described control unit is configured to the described information of the described multiple setting based on about described impedance matching circuit and the measurement of described impedance matching circuit is selected to the one setting in described multiple setting of described impedance matching circuit.

2. device as claimed in claim 1, it is characterized in that, for each in described multiple setting, the pre-performance that characterizes described impedance matching circuit is set, and described memory is configured to the information of the performance of the described impedance matching circuit of storage indication under described multiple setting.

3. device as claimed in claim 1, it is characterized in that, the described multiple setting of described impedance matching circuit is associated with obtaining residing different frequency when peak performance, and the described multiple setting of described impedance matching circuit residing frequency when obtaining peak performance sorts.

4. device as claimed in claim 1, it is characterized in that, described memory be configured to for each in described multiple setting arrange that this at least one switch that at least one switch in applicable frequency or frequency range, described impedance matching circuit is set of storage indication arranges, at least one variable wattless component in described impedance matching circuit at least one control and arrange or the information of its combination.

5. device as claimed in claim 1, is characterized in that, described measurement relates at least one in delivered power, return loss and load impedance.

6. device as claimed in claim 1, it is characterized in that, described control unit is configured to select based on the operating frequency of wireless device the initial setting up of described impedance matching circuit, and next higher setting or next lower setting based on the measurement of described impedance matching circuit being selected in described multiple setting.

7. device as claimed in claim 1, it is characterized in that, described control unit be configured to periodically receive measurement to described impedance matching circuit and based on described property measuring period determine and will still will select new setting for described impedance matching circuit for described impedance matching circuit maintains Set For Current.

8. device as claimed in claim 1, is characterized in that, described control unit is configured to the further environmental information based on wireless device and selects the one setting in described multiple setting of described impedance matching circuit.

9. a device, comprising:

Load circuit; And

Impedance matching circuit, described impedance matching circuit is configured to carry out impedance matching, the information of the described multiple setting of wherein said selection based on about described impedance matching circuit and the measurement to described impedance matching circuit for described load circuit based on the one setting of selecting for described impedance matching circuit in multiple setting.

10. device as claimed in claim 9, it is characterized in that, described impedance matching circuit comprises multiple wattless components and at least one switch and supports various configurations, and the described multiple setting of described impedance matching circuit and the described various configurations of described impedance matching circuit are associated.

11. devices as claimed in claim 10, is characterized in that, described various configurations comprises at least one in configured in series, shunting configuration, the configuration of " L " type, the configuration of " R " type, the configuration of " Π " type and T-shape configuration.

12. devices as claimed in claim 9, is characterized in that, described load circuit comprises antenna, and wherein said impedance matching circuit is that described antenna is carried out impedance matching.

13. devices as claimed in claim 9, is characterized in that, described load circuit comprises power amplifier, and wherein said impedance matching circuit is that described power amplifier is carried out output impedance coupling.

14. devices as claimed in claim 9, is characterized in that, described load circuit comprises low noise amplifier (LNA), and wherein said impedance matching circuit is that described LNA carries out input impedance coupling.

Carry out the method for impedance matching, comprising for 15. 1 kinds:

Obtain the measurement to impedance matching circuit; And

The information of the multiple setting based on about described impedance matching circuit and the described measurement of described impedance matching circuit is selected to the one setting in described multiple setting.

16. methods as claimed in claim 15, is characterized in that, further comprise:

Storage is about the information of the described multiple setting of described impedance matching circuit.

17. methods as claimed in claim 16, is characterized in that, described storage comprises:

The information of the performance of the described impedance matching circuit of storage indication under described multiple setting, the performance of wherein said impedance matching circuit is, for each in described multiple setting, pre-sign is set.

18. methods as claimed in claim 15, is characterized in that, described measurement relates at least one in delivered power, return loss and load impedance.

19. methods as claimed in claim 15, is characterized in that, described selection comprises:

Operating frequency based on wireless device is selected the initial setting up of described impedance matching circuit, and

Based on next higher setting or next the lower setting the measurement of described impedance matching circuit selected in described multiple setting.

20. methods as claimed in claim 15, it is characterized in that, described acquisition measurement comprises the measurement periodically obtaining described impedance matching circuit, and described selection comprises periodically determining it is to maintain Set For Current or will select new setting for described impedance matching circuit for described impedance matching circuit based on described measurement.

21. 1 kinds of equipment, comprising:

For obtaining the device of the measurement to impedance matching circuit; And

Be used for the information of the multiple setting based on about described impedance matching circuit and the measurement of described impedance matching circuit selected to the device of the described multiple a kind of setting arranging.

22. equipment as claimed in claim 21, is characterized in that, also comprise:

For storing the device about the information of the described multiple setting of described impedance matching circuit.

23. equipment as claimed in claim 22, is characterized in that, describedly comprise for the device of storing:

For storing the device of information of the performance of the described impedance matching circuit of indication under described multiple setting, the performance of wherein said impedance matching circuit is, for each in described multiple setting, pre-sign is set.

24. equipment as claimed in claim 21, is characterized in that, described measurement relates at least one in delivered power, return loss and load impedance.

25. equipment as claimed in claim 21, is characterized in that, describedly comprise for the device of selecting:

Select the device of the initial setting up of described impedance matching circuit for the operating frequency based on wireless device, and

For the device based on the measurement of described impedance matching circuit being selected to the higher setting of described multiple next setting or next lower setting.

26. equipment as claimed in claim 21, it is characterized in that, describedly comprise the device for periodically obtaining the measurement to described impedance matching circuit for obtaining the device of measurement, and describedly comprise for periodically determining it is to maintain Set For Current or will select newly-installed device for described impedance matching circuit for described impedance matching circuit based on described measurement for the device of selecting.

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